K 10
svn:author
V 2
pi
K 8
svn:date
V 27
2019-07-04T19:13:00.689737Z
K 7
svn:log
V 1726
databases/cego: upgrade 2.44.14 -> 2.45.0

- Added table alias feature to grammar definition. Table aliases
  allow alternate table name and attribute name definitions for a
  table ( create alias ... )
- Added classes CegoAliasObject and CegoAttrAlias for table alias handling
- Implemented base semantic actions for creating, listing and
  describe alias objects ( still no usage )
- In CegoDistManager::registerObjects, added registration for fkey,
  check, trigger and alias
- Added alias mapping for insert, update and delete queries (
  CegoQueryHelper::mapAliasPredicate still to implement )
- Basic alias mapping for select works, here's a sample SQL script
  drop if exists table t1;
  list alias;
  desc alias a1;
  drop if exists alias a1;
  create table t1 ( a int, b string(30));
  create alias a1 on t1 ( a as ax, b as bx );
  insert into a1 ( ax, bx ) values ( 1, 'XXX');
  insert into a1 ( ax, bx ) values ( 2, 'YYY');
  insert into a1 ( ax, bx ) values ( 3, 'ZZZ');
  select ax from a1;
- More work on table alias handling. Now works with more sophisticated
  select queries ( e.g. select ax from a1 aa where aa.ax = 1; ) For
  this, some fixes had to be done in CegoContentObject, since the the
  table alias attribute ( _tabAlias ) was not setup in constructor
  and other methods
- Added alias and trigger xml export and import feature ( trigger
  xport was still not implemented ) Fix in CegoDbThread::loadObjects
  for trigger reload, instead of triggerList.Next(), triggerList.First()
  was called, which result in an infinite loop in case of existing
  trigger objects
- Added trigger and alias object handling to CegoXPorter binary
  export and import

Submitted by:	Bjoern Lemke <lemke@lemke-it.com>

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